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Question

The upper eyelid of frog is

A
Thick
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B
Thin
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C
Absent
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D
None of these
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Solution

The correct option is A Thick
Frogs have a regular set of eyelids which helps them to keep their eyes moist and clean. They have a bottom lid that stays still and an upper lid that blinks. Frogs also possess a third eyelid that serves a different purpose. This one is called as the nictitating membrane. It is a semi-transparent lid that covers the eye completely, helping the frog see underwater and hide from predators.
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